I could booze you could booze he could booze we could booze you could booze they could booze
V-ing form
I could be boozing you could be boozing he could be boozing we could be boozing you could be boozing they could be boozing
Perfect
I could have boozed you could have boozed he could have boozed we could have boozed you could have boozed they could have boozed
V-ing perfect
I could have been boozing you could have been boozing he could have been boozing we could have been boozing you could have been boozing they could have been boozing
Negation
Simple form
I couldn't booze you couldn't booze he couldn't booze we couldn't booze you couldn't booze they couldn't booze
V-ing form
I couldn't be boozing you couldn't be boozing he couldn't be boozing we couldn't be boozing you couldn't be boozing they couldn't be boozing
Perfect
I couldn't have boozed you couldn't have boozed he couldn't have boozed we couldn't have boozed you couldn't have boozed they couldn't have boozed
V-ing perfect
I couldn't have been boozing you couldn't have been boozing he couldn't have been boozing we couldn't have been boozing you couldn't have been boozing they couldn't have been boozing
Interrogative form
Simple form
could I booze? could you booze? could he booze? could we booze? could you booze? could they booze?
V-ing form
could I be boozing? could you be boozing? could he be boozing? could we be boozing? could you be boozing? could they be boozing?
Perfect
could I have boozed? could you have boozed? could he have boozed? could we have boozed? could you have boozed? could they have boozed?
V-ing perfect
could I have been boozing? could you have been boozing? could he have been boozing? could we have been boozing? could you have been boozing? could they have been boozing?
Interro-negative form
Simple form
couldn't I booze? couldn't you booze? couldn't he booze? couldn't we booze? couldn't you booze? couldn't they booze?
V-ing form
couldn't I be boozing? couldn't you be boozing? couldn't he be boozing? couldn't we be boozing? couldn't you be boozing? couldn't they be boozing?
Perfect
couldn't I have boozed? couldn't you have boozed? couldn't he have boozed? couldn't we have boozed? couldn't you have boozed? couldn't they have boozed?
V-ing perfect
couldn't I have been boozing? couldn't you have been boozing? couldn't he have been boozing? couldn't we have been boozing? couldn't you have been boozing? couldn't they have been boozing?